Ø ’ : a growth performance index, equal to, where K and are parameters of the VBGF. Ø : a growth performance index, equal to log 10 K + 2/3 log 10 W ¥ Ppt : parts per thousand, used to express salinity (though salinity doesn’t really require such symbol). PH : a measure of the acidity (pH7) of a liquid. OT : length OTher than FL, SL, TL or WD used to express size in fish. Nm : nannometers (thousandth of a millimeter). : size (number) of a population of fish at a given time t. NG : not given refers here to length type. N : number of specimens used to derive length-weight, fecundity-length, or other relationship, or included on a graph. S -1 : meter per second: used to express swimming speed of fish. M% : natural mortality in % (as recorded in aquaculture experiments). MDB : file extension denoting a Microsoft Access data file. MDA : file extension denoting a Microsoft Access file holding user and security information. M : instantaneous rate of natural mortality (time -1), i.e., M = Z - F. L t : mean length at age t predicted by the VBGF. L max: maximum individual length on record for a species or one of its populations (depending on context). L m : mean length at first maturity of the fish of a given population. : asymptotic length (also L inf): a parameter of the VBGF, expressing the mean length the fish of a given stock would reach if they were to grow for an infinitely long period. : median lethal concentration, i.e., concentration of a substance sufficient to kill 50% of the fish exposed to it during a specified period. L : symbol for the individual body length of a fish. : gross food conversion efficiency ratio of growth increment/food ingested during a given period. K : parameter of the VBGF, of dimension time -1, and expressing the rate at which the asymptotic length (or weight) is approached. JPEG : Joint Photographic Experts Group an image compression standard a format used to compress color photos. Hg : used to express partial pressure as millimeters of mercury e.g., in ‘mmHg of oxygen’ (from Latin ‘hydragyrum’ name for mercury, liquid silver). : measure of genetic heritability also height squared of caudal fin, used to compute its aspect ratio. GIF : Graphic Interchange Format, used to store black-and-white pictures in FishBase G : specific growth in weight, defined by where and are successive weights, and the growing period used for fish larvae Also: absolute fecundity.įL :ğork length the length of a fish, measured from the tip of the snout to the tip of the shortest central rays of the caudal fin. : coefficient of variation (=standard deviation/mean) often expressed as % of the mean.ĭ : duration of a larval stage also, in eggs: time to hatching (in days).ĭl/dt : growth rate in length first derivative of the VBGF for length.ĭw/dt : growth rate in weight first derivative of the VBGF for weight.ĭ T : difference within an annual cycle of the highest mean monthly temperature (summer) and the lowest mean monthly temperature (winter).į : instantaneous rate of fishing mortality (time -1), i.e., F = Z – M. ☌ : degree celsius, used for expressing temperature.ĬD-ROM:Ĝompact Disc-Read Only Memory a standard for compact disc used as a digital memory medium for personal computers.Ĭ.V. In practice, C ranges from C = 0 (no oscillations) to C = 1, when dl/dt = 0 at the winter point (WP). Also: an undefined measure of length, which may refer to SL, FL or TL.ī/W : black-and-white: refers here to pictures of fish.Ĭ : parameter of the von Bertalanffy equation, modified to express seasonal growth oscillations, and expressing the amplitude of such oscillations. Also Bunsen coefficient for oxygen.Ī : aspect ratio of the fish’s caudal fin, used as index of its level of activity, and defined by h 2/s, where h is the height of the caudal fin, and s its surface area.īL : body length: reference length for the swimming speed of fishes (BL × : "beta": exponent in a relationship linking K 1 and W. : "lambda maximum": the wave length of light (in nm) to which the visual pigments in fish eyes are most sensitive. %BWD : a measure of the dry weight of feed provided daily to fish held in captivity, in % of their weight.